Recovery method of extractant in extract

Abstract

The invention aims to provide a recovery method of residual extractant in extract, which has the advantages of simple process, clear process principle, convenient operation and low investment cost. By adopting the recovery method, the residual extractant in the extract can be recovered as much as possible and reduces waste and cost for enterprises. For achieving the purposes, the recovery method takes the technical steps of: enabling the extract with pressure to enter a recovery tank; releasing a gas-liquid mixture generated by a high-pressure gas dissolving device from the bottom of the recovery tank; carrying out direction guide on bubbles by a guide plate in the recovery tank to wrap extractant molecules and carry the extractant molecules to liquid level; blasting the bubbles under the liquid and gas pressure difference of the bubbles to release and accumulate the extractant molecules wrapped by the bubbles on the liquid level; and scraping the accumulated extractant from the liquid level by an oil collector and discharging the scraped extractant in a collecting bowl at the tail end of the oil collector to realize recovery. The whole recovery process has the advantages of simple process equipment, simple process flow and low investment; and by adopting the method, almost all the residual extractant in the extract can be recycled.

Description

technical field [0001] The invention relates to a method for recovering an extractant in an extract liquid. Background technique [0002] Extraction is a unit operation that uses the different solubility of the components in the system to separate the mixture. Using the principle of similar miscibility, there are two extraction methods: [0003] Liquid-liquid extraction, using a selected solvent to separate a certain component in a liquid mixture, the solvent must be immiscible with the extracted mixture liquid, have selective solubility, and must have good thermal and chemical stability , and has little toxicity and corrosiveness. For example, use benzene to separate phenols in coal tar; use organic solvents to separate olefins in petroleum fractions; use CCl 4 Extraction of Br in water 2 . [0004] Solid-liquid extraction, also called leaching, uses solvents to separate components in solid mixtures, such as leaching sugars in beets with water; leaching soybean oil in s...

AI Technical Summary

Problems solved by technology

However, according to the law of distribution, the used extractant cannot be completely separated and always remains in the extract in a certain proportion. Therefore, after repeated use many times, there will be a considerable amount of extractant remaining in the extract. The value of the extractant is often not low, and its residue is actually a waste of raw materials, which increases the production cost of the enterprise.

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